docs: def make_json_serializable(doc: Dict):
          """
          Make the document JSON serializable. This is a poor man's implementation that handles dates and nothing else.
          This method modifies the given document in place.
  
          Args:
              doc: A Python Dictionary, typically a CDR object.
  
          Returns: None
  
          """
          for k, v in doc.items():
              if isinstance(v, datetime.date):
                  doc[k] = v.strftime("%Y-%m-%d")
              elif isinstance(v, datetime.datetime):
                  doc[k] = v.isoformat()